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      <title>商用消息实现方案 - 交互式测验</title>
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      </style>
    </head>
    <body>
      <div class="main-wrapper">
          <div class="quiz-container">
            <div class="quiz-header">
              <h1>商用消息实现方案 - 交互式测验</h1>
              <p>检验你对文档内容的理解程度</p>
            </div>
            <div id="quiz-content">
                <div class="quiz-body">
                    <div class="progress-bar">
                        <div id="progress-indicator"></div>
                    </div>
                    <div id="question-container">
                      <p id="question-text"></p>
                      <ul class="options-list" id="options-list"></ul>
                    </div>
                    <div id="result-container"></div>
                    <div id="hint-container" class="hint-container"></div>
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                <div class="quiz-footer" id="quiz-footer">
                  <button id="prev-btn" class="nav-btn">上一题</button>
                  <button id="hint-btn" class="nav-btn" style="background-color: #ffc107; color: #333; box-shadow: 0 4px 12px rgba(255,193,7,0.3);">提示</button>
                  <button id="next-btn" class="nav-btn">下一题</button>
                </div>
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      </div>

      <script>
        const quizData = [
  {
    "question": "在企业级RocketMQ架构中，NameServer集群的核心职责是什么？",
    "options": [
      "负责消息的存储、持久化和传输。",
      "负责服务发现和路由功能，维护Broker的元数据信息。",
      "负责实现Broker主节点的自动故障转移。",
      "作为消息消费者，负责处理具体的业务逻辑。"
    ],
    "correctAnswerIndex": 1,
    "explanation": "NameServer是RocketMQ的“注册中心”，它的主要功能是服务发现和路由。它接收Broker集群的心跳，并为Producer和Consumer提供关于Topic和Broker的最新路由信息。它本身不存储消息，设计上是无状态的，可以水平扩展。",
    "source": "文档中「核心组件」->「NameServer集群」部分",
    "hint": "这个组件扮演着类似“目录服务”或“电话簿”的角色，告诉生产者和消费者应该去哪里发送或接收消息。"
  },
  {
    "question": "根据文档，为了实现Broker的自动主从切换以提升高可用性，RocketMQ依赖于哪个特定组件？",
    "options": [
      "NameServer集群",
      "RocketMQ Dashboard",
      "Dledger组件",
      "Producer客户端的故障转移逻辑"
    ],
    "correctAnswerIndex": 2,
    "explanation": "文档明确指出，通过Dledger组件可以实现自动的主从切换。Dledger是一个基于Raft协议的、轻量级的Java库，用于实现高可用的、自动容灾的Broker主从架构。当主节点故障时，Dledger可以自动从从节点中选举出新的主节点。",
    "source": "文档中「高可用设计」->「自动故障转移」部分",
    "hint": "在“自动故障转移”一节中，提到了一个用于实现此功能的特定组件名称。"
  },
  {
    "question": "在Broker的多副本机制中，同步复制（Synchronous Replication）和异步复制（Asynchronous Replication）之间存在怎样的权衡？",
    "options": [
      "同步复制性能更高，但可能丢失数据；异步复制数据一致性更强。",
      "同步复制保证了数据的强一致性，但会牺牲性能；异步复制则能提供更高的性能，但存在数据丢失的风险。",
      "同步复制仅用于同城双活场景，而异步复制专用于异地多活场景。",
      "同步复制由Producer触发，异步复制由Broker内部调度。"
    ],
    "correctAnswerIndex": 1,
    "explanation": "同步复制要求主节点在收到消息后，必须等待消息成功复制到一个或多个从节点后，才向生产者返回成功响应。这确保了数据不会丢失，但增加了响应延迟。异步复制则是主节点收到消息后立即响应生产者，然后在后台将消息复制到从节点，性能更好，但在主节点故障时，未及时复制的数据可能会丢失。",
    "source": "文档中「高可用设计」->「多副本机制」部分",
    "hint": "思考一下在分布式系统中，保证数据一致性和提升系统性能通常会面临什么样的经典抉择？"
  },
  {
    "question": "对于需要区域级故障容灾的大型企业，文档推荐了哪种部署拓扑，并提到了实现该拓扑的关键技术是什么？",
    "options": [
      "单集群多副本部署，关键技术是Broker主从架构。",
      "混合云部署，关键技术是公有云与私有云的资源整合。",
      "多集群异地多活部署，关键技术是RocketMQ的消息复制功能。",
      "同城双活部署，关键技术是跨机房的负载均衡。"
    ],
    "correctAnswerIndex": 2,
    "explanation": "文档指出，“多集群异地多活部署”适用于大型企业和关键业务系统，它通过在不同地域（城市）部署多个RocketMQ集群，并利用“RocketMQ的消息复制功能”来实现跨集群的数据同步，从而支持区域级别的灾难切换和容灾。",
    "source": "文档中「部署拓扑」->「多集群异地多活部署」部分",
    "hint": "哪种部署方式能抵御整个城市或区域级别的故障？它依赖什么机制来保持不同地域数据的一致性？"
  },
  {
    "question": "在性能优化方面，为了显著提高Broker的写入性能，文档推荐了哪项具体的硬件优化措施？",
    "options": [
      "为NameServer配置更多的CPU核心。",
      "使用SSD（固态硬盘）存储CommitLog。",
      "增加Consumer集群的内存容量。",
      "为Producer端配置高性能万兆网卡。"
    ],
    "correctAnswerIndex": 1,
    "explanation": "CommitLog是RocketMQ存储所有消息的核心文件，对它的写入性能直接决定了整个系统的吞吐量。由于磁盘I/O是主要瓶颈，文档建议使用SSD来存储CommitLog，因为SSD提供了比传统机械硬盘高得多的随机和顺序写入速度，从而可以极大地提升性能。",
    "source": "文档中「性能优化」->「硬件优化」部分",
    "hint": "消息写入性能的主要瓶颈通常在于磁盘I/O。文档提到了一个关键文件和应该使用哪种类型的存储介质来加速它。"
  },
  {
    "question": "在监控RocketMQ时，哪个关键指标最能直接反映消费端的处理能力是否跟得上生产端的消息发送速度？",
    "options": [
      "TPS/QPS（每秒事务数/查询数）",
      "消息延迟（Message Latency）",
      "消息堆积量（Message Backlog）",
      "GC情况（垃圾回收状态）"
    ],
    "correctAnswerIndex": 2,
    "explanation": "消息堆积量指的是存储在Broker上但尚未被消费者处理的消息数量。如果这个数值持续增长，说明消费者的处理速度慢于生产者的发送速度，消费能力不足。因此，它是衡量消费能力是否匹配生产能力的最直接、最重要的指标。",
    "source": "文档中「监控实施」->「关键指标」部分",
    "hint": "如果一个工厂的生产线速度超过了包装线的速度，那么在两条线之间会发生什么现象？"
  },
  {
    "question": "关于Consumer（消费者）集群，文档提到了它支持的两种消费模式是什么？",
    "options": [
      "拉取（Pull）消费和推送（Push）消费",
      "集群（Clustering）消费和广播（Broadcasting）消费",
      "同步（Sync）消费和异步（Async）消费",
      "批量（Batch）消费和单条（Single）消费"
    ],
    "correctAnswerIndex": 1,
    "explanation": "文档中明确指出，Consumer集群支持“集群消费”和“广播消费”两种模式。集群消费模式下，同一个Consumer Group内的所有消费者共同分担Topic下的消息，每条消息只会被投递给组内的一个消费者。广播消费模式下，消息会被投递给Consumer Group内的每一个消费者。",
    "source": "文档中「核心组件」->「Consumer集群」部分",
    "hint": "一种模式是让一个团队的成员分工合作处理任务，另一种是向团队里的每个人都发送一份通知。"
  }
];
        console.log("Quiz Data:", JSON.parse(JSON.stringify(quizData))); // 添加这行用于调试，以可展开的JSON格式输出
        
        let currentQuestionIndex = 0;
        let score = 0;
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        const hintContainerEl = document.getElementById('hint-container');

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          optionsListEl.innerHTML = '';
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            return;
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            const isCorrect = optionIndex === currentQuestion.correctAnswerIndex;

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            nextBtn.style.display = 'block';
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            nextBtn.disabled = false; // 最后一题时，下一题按钮不禁用，而是用于显示报告
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                hintBtn.disabled = true;
                hintContainerEl.style.display = 'none';
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            resultContainerEl.innerHTML = ''; // 清空之前的结果
            const resultBox = document.createElement('div');
            resultBox.className = `result-box ${isCorrect ? 'correct' : 'incorrect'}`;
            
            let html = `<h3>${isCorrect ? '回答正确！' : '回答错误'}</h3>`;
            if (!isCorrect) {
                html += `<p><strong>正确答案是：</strong> ${questionData.options[questionData.correctAnswerIndex]}</p>`;
            }
            html += `<div class="explanation-text">${questionData.explanation}</div>`;
            html += `<div class="source-text">来源: ${questionData.source}</div>`;
            
            resultBox.innerHTML = html;
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                // 高亮正确答案
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                    child.classList.add('correct'); // 需要添加CSS样式
                    child.style.backgroundColor = '#d4edda';
                    child.style.borderColor = '#c3e6cb';
                }
                // 如果选错了，高亮错误选项
                if (!isCorrect && index === userAnswers[currentQuestionIndex]) {
                    child.classList.add('incorrect'); // 需要添加CSS样式
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                hintContainerEl.style.display = 'none';
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        function showFinalScore() {
            document.querySelector('.quiz-body').style.display = 'none';
            document.getElementById('quiz-footer').style.display = 'none';

            const correctCount = score;
            const totalQuestions = quizData.length;
            const answeredCount = userAnswers.filter(a => a !== null).length;
            const wrongCount = answeredCount - correctCount;
            const skippedCount = totalQuestions - answeredCount;
            const accuracy = totalQuestions > 0 ? Math.round((correctCount / totalQuestions) * 100) : 0;
            const errorRate = totalQuestions > 0 ? Math.round((wrongCount / totalQuestions) * 100) : 0;

            const finalScoreHtml =
                '<div class="final-score-container">' +
                '<h2>答题报告</h2>' +
                '<div class="score-summary">' +
                '<div class="score-card">' +
                '<h3>得分</h3>' +
                '<p>' + correctCount + ' / ' + totalQuestions + '</p>' +
                '</div>' +
                '<div class="score-card">' +
                '<h3>正确率</h3>' +
                '<p>' + accuracy + '%</p>' +
                '</div>' +
                '<div class="score-card">' +
                '<h3>错误率</h3>' +
                '<p>' + errorRate + '%</p>' +
                '</div>' +
                '<div class="score-card score-details">' +
                '<table>' +
                '<tr><td>正确</td><td>' + correctCount + '</td></tr>' +
                '<tr><td>错误</td><td>' + wrongCount + '</td></tr>' +
                '<tr><td>未答</td><td>' + skippedCount + '</td></tr>' +
                '</table>' +
                '</div>' +
                '</div>' +
                '<div class="report-actions">' +
                '<button id="review-btn">回顾测验</button>' +
                '<button class="primary" onclick="location.reload()">再试一次</button>' +
                '</div>' +
                '</div>';

            let reportEl = document.querySelector('.final-score-container');
            if (reportEl) {
                reportEl.remove();
            }
            quizContentEl.insertAdjacentHTML('beforeend', finalScoreHtml);
            document.getElementById('review-btn').addEventListener('click', reviewQuiz);
        }

        function reviewQuiz() {
            const reportEl = document.querySelector('.final-score-container');
            if (reportEl) {
                reportEl.remove();
            }

            document.querySelector('.quiz-body').style.display = 'block';
            document.getElementById('quiz-footer').style.display = 'flex';
            
            currentQuestionIndex = 0;
            loadQuestion();
            updateNavigationButtons(); // Ensure nav buttons are correctly displayed
        }

        // Event Delegation for options
        optionsListEl.addEventListener('click', (event) => {
            if (event.target && event.target.matches('li.option-item')) {
                // Check if the question has already been answered
                if (userAnswers[currentQuestionIndex] === null) {
                    const selectedIndex = parseInt(event.target.dataset.index, 10);
                    selectOption(selectedIndex);
                }
            }
        });

        prevBtn.addEventListener('click', goToPreviousQuestion);
        nextBtn.addEventListener('click', goToNextQuestion);
        hintBtn.addEventListener('click', showHint);
        
        // 初始加载
        loadQuestion();
      </script>
    </body>
    </html>
  